具有介孔孔壁的三维有序大孔Ce_(0.6)Zr_(0.4)O_2固溶体的合成与表征  

Synthesis and Characterization of Three-Dimensional Ordered Macroporous Ce_(0.6)Zr_(0.4)O_2 Solid Solutions with Mesoporous Walls

作　　者：李惠宁[1] 戴洪兴[1] 何洪[1] 

机构地区：[1]北京工业大学环境与能源工程学院化学化工系催化化学与纳米科学研究室,北京100124

出　　处：《中国稀土学报》2009年第4期583-586,共4页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金(20473006);北京市属市管高等学校"拔尖创新人才计划"资助项目

摘　　要：以有序密堆积的聚甲基丙烯酸甲酯(PMMA)单分散微球为大孔模板剂、以三嵌段共聚物EO20PO70EO20(P123)为介孔模板剂、以硝酸亚铈和硝酸氧锆为金属源,采用溶剂挥发自组织法首次合成了具有介孔孔壁的三维有序大孔结构的Ce0.6Zr0.4O2固溶体,并利用XRD,TEM/SAED,N2吸附-脱附等技术表征了所合成的铈锆固溶体的物理性质。结果表明,经500℃灼烧所制得的Ce0.6Zr0.4O2固溶体为多晶单相立方结构,具有三维有序大孔结构,其大孔直径为50～200nm,壁厚为10～40nm,大孔孔壁具有孔径为3～4nm的蠕虫状介孔结构。Three-dimensional ordered macroporous Ce0.6Zr0.402 solid solutions with mesoporous walls were synthesized using solvent-evaporation self-organization strategy with well-aligned close-packed polymethyl methacrylate （PMMA） monodispersed microspheres as macropore template, triblock copolymer EO20PO70EO20 （P123） as mesopore template, and Ce （ NO3 ）3 and ZrO（NO3 ）2 as metal source. The physical properties of these materials were characterized by means of X-ray diffraction （XRD）, transmission electron microscopy （ （ SAED TEM ）, selected area electron diffraction ）, and nitrogen adsorption-desorption techniques. It was shown that the Ce0.6Zr0.4O2 solid solution fabricated after calcination at 500℃ possessed a single-phase cubic polycrystalline structure and a three-dimensional ordered macroporous architecture with a macropore diameter of 50-200 nm and a wall thickness of 10 -40 nm. The walls exhibited a wormhole-like mesoporous structure with a diameter of 3-4 nm.

关 键 词：铈锆固溶体 大孔 介孔 模板合成法 稀土 

分 类 号：O643.3[理学—物理化学]